06_errors.py

"""
Examples of basic error handling with try / except / else / finally.

This script:
- asks the user for a number
- tries to divide 100 by that number
- handles invalid input and division by zero gracefully
"""


def safe_divide(divisor_str: str) -> str:
    """Try to divide 100 by the given string input.

    Returns a message describing the result or the error.
    """
    try:
        divisor = float(divisor_str)
        result = 100 / divisor
    except ValueError:
        return "Please enter a valid number. For example: 5 or 2.5."
    except ZeroDivisionError:
        return "You cannot divide by zero. Try a nonzero number."
    else:
        return f"100 divided by {divisor} is {result}."
    finally:
        # This block always runs. In a real app, you might use it for cleanup.
        # Here we keep it simple to show the structure.
        print("safe_divide operation finished.")


def main() -> None:
    user_input = input("Enter a number to divide 100 by: ")
    message = safe_divide(user_input)
    print(message)


if __name__ == "__main__":
    main()
3